民歌是人民反映生活表达情感的产物,由群众集体创作,分为山歌、号子和()。 A.小调 发布时间:2017-08-15 16:22 │ 来源:www.tikuol.com 题型:单项选择题 问题: 民歌是人民反映生活表达情感的产物,由群众集体创作,分为山歌、号子和()。A.小调B.曲艺C.器乐曲D.歌谣
题型:单项选择题 Although the average reader spends more than 4, 000 pounds on books in their lifetime, 55 percent say they buy them for decoration and have no ____ of reading them. [ ]A. advantage B. attempt C. evidence D. intention 查看答案
题型:单项选择题 如图所示,在研究斜面机械效率时,伟华同学用160N的力将重为240N的箱子沿斜面从底部推到高为100cm的顶端,已知斜面长为300cm,则他所做的有用功是______J,总功是______J,机械效率是______. 查看答案